是否有一种简单的单行方式来获取表单的数据，就像以经典的仅html方式提交表单一样?
例如:
<form>
<input type="radio" name="foo" value="1" checked="checked" />
<input type="radio" name="foo" value="0" />
<input name="bar" value="xxx" />
<select name="this">
<option value="hi" selected="selected">Hi</option>
<option value="ho">Ho</option>
</form>
输出:
{
"foo": "1",
"bar": "xxx",
"this": "hi"
}
像这样的东西太简单了，因为它没有(正确地)包括文本区域，选择，单选按钮和复选框:
$("#form input").each(function () {
data[theFieldName] = theFieldValue;
});
你们都不完全正确。你不能写:
formObj[input.name] = input.value;
因为这样，如果你有一个多选列表，它的值将被最后一个覆盖，因为它被传输为:"param1": "value1"， "param1": "value2"。
所以，正确的方法是:
if (formData[input.name] === undefined) {
formData[input.name] = input.value;
}
else {
var inputFieldArray = $.merge([], $.isArray(formData[input.name]) ? formData[input.name] : [formData[input.name]]);
$.merge(inputFieldArray, [input.value]);
formData[input.name] = $.merge([], inputFieldArray);
}
这是一个很好的香草JS函数，我写来提取表单数据作为一个对象。它还具有向对象中插入附加内容和清除表单输入字段的选项。
const extractFormData = ({ form, clear, add }) => {
return [].slice.call(form.children).filter(node => node.nodeName === 'INPUT')
.reduce((formData, input) => {
const value = input.value
if (clear) { input.value = '' }
return {
...formData,
[input.name]: value
}
}, add)
}
下面是一个使用post请求的例子:
submitGrudge(e) {
e.preventDefault()
const form = e.target
const add = { id: Date.now(), forgiven: false }
const grudge = extractFormData({ form, add, clear: true })
// grudge = {
// "name": "Example name",
// "offense": "Example string",
// "date": "2017-02-16",
// "id": 1487877281983,
// "forgiven": false
// }
fetch('http://localhost:3001/api/grudge', {
method: 'post',
headers: { 'Content-Type': 'application/json' },
body: JSON.stringify(grudge)
})
.then(response => response.json())
.then(grudges => this.setState({ grudges }))
.catch(err => console.log('error: ', err))
}
你可以使用这个函数从表单中获取一个对象或JSON。
使用它:
var object = formService.getObjectFormFields（“#idform”）;
function getObjectFormFields(formSelector)
{
/// <summary>Função que retorna objeto com base nas propriedades name dos elementos do formulário.</summary>
/// <param name="formSelector" type="String">Seletor do formulário</param>
var form = $(formSelector);
var result = {};
var arrayAuxiliar = [];
form.find(":input:text").each(function (index, element)
{
var name = $(element).attr('name');
var value = $(element).val();
result[name] = value;
});
form.find(":input[type=hidden]").each(function (index, element)
{
var name = $(element).attr('name');
var value = $(element).val();
result[name] = value;
});
form.find(":input:checked").each(function (index, element)
{
var name;
var value;
if ($(this).attr("type") == "radio")
{
name = $(element).attr('name');
value = $(element).val();
result[name] = value;
}
else if ($(this).attr("type") == "checkbox")
{
name = $(element).attr('name');
value = $(element).val();
if (result[name])
{
if (Array.isArray(result[name]))
{
result[name].push(value);
} else
{
var aux = result[name];
result[name] = [];
result[name].push(aux);
result[name].push(value);
}
} else
{
result[name] = [];
result[name].push(value);
}
}
});
form.find("select option:selected").each(function (index, element)
{
var name = $(element).parent().attr('name');
var value = $(element).val();
result[name] = value;
});
arrayAuxiliar = [];
form.find("checkbox:checked").each(function (index, element)
{
var name = $(element).attr('name');
var value = $(element).val();
result[name] = arrayAuxiliar.push(value);
});
form.find("textarea").each(function (index, element)
{
var name = $(element).attr('name');
var value = $(element).val();
result[name] = value;
});
return result;
}
